STU/ST/BS/BC Bore pump

STU/ST/BS/BC Bore pump troubleshooting

Malfunction Routine/Cause	Solutions
Open phase(3 phase) Y connection→burns 2 wires. △connection→burns 1 wire.	Checks power source. Checks cable. Control panel electric switch and operation protection switch are open phase
3 phase current is not stable, only 2 of 3 phase wires are normal.	Checks electric switch if it has bas connection. Checks ground or underground cable if it splits cause ground wireinactive.
Capacity is decreased or it can’t pump water or current is small.	Impeller, pump bearing and motor bearing wore out.
Motor fan rotate direction is wrong or capacity is decreased or it can’t pump water.	If you are using 3 phase motor,you can change any 2 of 3phase wires. It will return to normal.
The voltage or frequency is low that will cause motor speed, head and capacity to decrease.	Checks voltage or frequency. If necessary, please contact motor supplier to fix it.
Capacity is not stable.	Increases the length of discharge pipeline and submerges the pump into lower water level. If both methods still can’t improve, you can close gate valve a little bit in order to make suction capacity and discharge capacity to be the same.
The cable or motor wiring insulation breaks down	Closes the power. Uses high resistance meter to test motor and cable. If the motor is malfunction, it needs to be send back to the supplier.
The pump can’t start. The current is high.	Send it back to the factory for repair.
Start switch or relay is malfunctioned. Fuse or overload protector is too small.	Replaces or adjusts it.
The power is off or voltage is wrong.	Uses volmeter to check its voltage value and rated value differences. It can’t exceed +5% or -5%.